Power cutting attachment for buttonhole-sewing machines.



Patented 'Nov. ll, M2.

P. FAB ISC H. POWER CUTTING ATTACHMENT FUR BUTTONHOLE SEWING MACHINES.

(Appliatiommed Oct. 21; 1901.)

(No linden 2 Sheets-Shani l.

Wtfzess es.

Patented Nov. I l, I902.

P. FABISCH. POWER CUTTING ATTACHMENT FOR BU'I'TDIIHC'LE SEWING-MACHINES.

(Application filed Oct. 21, 1901.)

2 Sheets-8haet 2.

(No Model.)

in: Nbnmsyrrias 09., PHOTO LlTNOq WASNINCITON. u. c.

cable bearing for the eccentric which raises PHILIP FABISOI-I, OFBALTIMORE, MARYLAND.

POWER CUTTING ATTACHMENT FOR BUTTONHOLE-SEWING MACHINES.

SPECIFICATION forming part of Letters latent No. 713,078, dated November11, 1902. Application filed 0ctober2l, 1901. Serial No. 79,397. 1T0model.

'i'o aZZ whom it may concern: I

Be it known that I, PHILIP FABISOH, a citizen of'the ,United States,residing at Baltimore, in the State of Maryland, haveinvented certainnew and useful Improvements in Power Cutting Attachments for Buttonhole-Sewing Machines, of which the following is a specification.

This invention relates to cutting attachments for buttonhole-sewingmachines; and one of the objects of the invention is to provide acutting attachment ofthis character which can be effectively actuated bypoweroperated means and which can readily be thrown by the operator intoengagement with the power-operated means either before or af: ter thebuttonhole has been worked.

With this and other objects in view the invention consists in certainconstructions, arrangements, and combinations of the'parts hereinafterfully described and claimed, reference being had to the accompanyingdrawings, in Which- Figure 1 is a side elevation of a buttonhoiesewingmachine provided with my improved cutting attachment, parts being brokenaway and in section to better illustrate the construction. Fig. 2 is anenlarged elevation of one end of the machine,'showing parts in sectionon the line 2 2 of'l ig. 1. Figs. 3 and 4: are detail views of the twosections of the adjustable knife-holder shown detached from each other.Fig. 5 is a detail view of the knife-holder with its knife in place.Fig. 6 is a detail view of the knife. Fig. 7 is a detail viewillustrating the vertically-adjustthe knife-holder. Fig. 8 is a sideelevation, with part in section, of the forward or free end of thepresser-bar. Fig.9 is an enlarged sectional view taken on the line 9 9of Fig. 1. Fig.10 is a detail view of the coupler-bar which temporarilyconnects the cutting mechanism with the power-operated means. Fig. 11 isa detail view of said con pier-bar, taken at right angles to Fig. 10.Fig. 12 is a detail view of an antifriction devicefor said coupler-bar.Figs. 13 and let are detail views of the camblock that is secured to oneend of said coupler-bar. Fig. 15 illustrates in detail theantifriction-roller that is carried on the lower 'ter.

end of the coupler-bar and also illustrates the spindle of said roller,which spindle detachably secures the cam-block to the coupler-bar.

Referring to the drawings by reference-let- 'ters, A designates thebed-plate, and B the arm, of a buttonhole-sewing machine of the ordinarytype, and C designates the table on which the machine is mounted.

Supported on the machine bed-plate A is a bracket-arm a, made rigid bybraces which extend both in front and back of the machine-arm B, (onlythe brace l) in front of said arm being shown,) and said bracket-armextendsupwardly and forwardly toward the forward end of the machine-armand is provided at its upper end with a pivot-bearing a. A presser-bar Dis fulcrumed intermediate of its ends in said pivot-bearing andoscillates'in a vertical plane, and pivotally secured to and dependingfrom the rear end of said presser-bar is a link-rod 0, provided at itslower end with a rocking foot 0. To the forward end of the presserbarDis pivotally secured a wear-plate cl, pressed upward by a spring etoward thelower face of the said bar and capable of being moved awayfrom said face by means of an adj Listing-screw f for the purpose oftaking up the wear of the cutting-block, said screw working through thesaid lever and bearing against the said wearplate, as shown best inFigs. 2 and 8.

Rigidly secured to that side of the needlebar housing g adjacent thepresser-bar D is a casing h, provided with a vertically-extend-- ingbore it, into which feather-screws h en- A knife-block carrier in theform of a rod E is mounted to reciprocate vertically in said bore h andis provided with a longitudinal groove t, which receives saidfeatherscrews, and is also provided at its upper end with a socket ordepression '11, in which an antifriction-ball t loosely rests, said ballbeing in contact with the wear-plate d on theforward end of thepresser-bar D, whereby when the said end of the bar is depressed the rodE will be pushed downwardly, and to the lower end of the rod E isrigidly secured a plate j, to which the knife-block] is attached. Acompression-spring 7c is secured to said plate 3' and to the casing hand tends to draw the knife-block carrier upward when the pressure ofthe presser-bar D is removed therefrom.

The horizontally-rotated feed-wheel F of the machine, part of which isshown in section in Fig. 2, is provided with an opening Z, which when itcomes into registry with an opening Z in the bed-plate just underneaththe knife-block 7" permits the knife 0 to be raised into contact withthe knife-block to cut the buttonhole. The knife-holder G for carryingthe knife 0 is constructed in two adjustably-connected sections, asshown in Figs. 3 and 4name1y, first, a pivot-section m, mounted to swingin a vertical plane between two ears 1 formed on the front edge of thebed-plate A, and said section provided with a recessed socket on, havinga set-screw m and, second, a knife-carrying section 11, provided with aslotted end a, by which it is adjustably held in the socket m, and alsoprovided with an opening 72 to receive the eyeshank 0' and alongitudinal groove 01 to receive the body 0 of said knife.

As is well known by those versed in the art of buttonhole-sewingmachines,diiferent feedwheels are employed in working difierentsizedbuttonholes, and the knife-openings of the different feed-wheels arelocated at different distances from the margins of the feed-wheels.These conditions necessitatea change in the relative positions ofdifferentsized knives, and to meet said conditions it has heretoforebeen necessary to entirely remove the knife-holder and replace it with alonger or shorterknife-holder and knife; but with the construction ofadjustable knifeholder I have provided it is only necessary to lengthenor shorten the knife-holder without removing the same and to place in ita longer or shorter knife, as the occasion may require.

In order to lift the knife-holder G, I have provided an eccentricp,having a cam action on the under side of the knife-holder and pivoted ona vertically-adjustable screw q, mounted in a ledge q, projecting fromthe bed-plate underneath the knife-holder, so that by means of saidscrew the eccentric may be adjusted vertically to take up wear. The saideccentric p is preferably provided with two flanges 19', adapted to takeone on each side of a guide-flange n on the lower side of theknife-holder section 72, though said flanges are not necessary, and itis also provided with a transverse slot 19 in which a pin 19 on one endof the eccentric-rod H works. The said eccentric-rod H is constructed intelescopic sections p 1), capable of yielding in a longitudinaldirection by means of a spring 19, and at its end opposite the pin 1J itis pivotallyconnected toone arm of a vertically-rocking bell-crank leverJ, fulcrumed underneath the bed-plate A adjacent the link-rod c. Theother arm of said lever is pivotally connected to the lower end of saidlink-rod.

In practice when the link-rod c is raised the eccentric-rod H will bymeans of the eccentric p raise the knife-holder and knife up through theopening in the bed-plate and feed-wheel and. at the same time rock thepresser-bar D, which moves the knife-block carrier E, with itsknife-blockj, toward the knife. The proportion of parts is such that theknife will be raised to the upper limit of its movement while theknife-block is yet some distance from the knife; but the construction ofthe eccentric-rod I-I allows said rod to yield longitudinally until thelink-rod c has been raised far enough to bring the knife-block withforce against the knife, and thereby cut the buttonhole.

The power-operated mechanism for actuating the hereinbefore-describedcutting attachment is illustrated on Sheet 1 of the accompanyingdrawings and will now be described. The table 0 is provided with avertical opening 0, in which the rocking foot 0 of the link-rod c isreceived. Rigidly secured to the table underneath said opening is anopen frame K, in which the continuously-rotati'ng power-shaft L isjournaled. The said shaft is provided with a pulley P, connected by beltQ to the shaft R for driving the stitch-forming mechanism, and acam-wheel M is secured on said shaft L and is provided on one side witha cam 0'. To that side of the frame K adjacent the cam r is secured ahousing N, provided in one wall with a vertical slot 4", opening intothe frame, and also provided in its opposite wall with an opening 0*.Mounted to move up and down in said housing is a coupler-bar 0, providedat its upper end with a socket s, which fits onto the rocking foot 0 ofthe link-rod c. Said couplerbar is provided at one side of its lower endwith a cam-block s and at the other side of said end with anantifriction-roller 8 A coil-spring 3 which is secured to saidcoupler-bar and to a pin 10 in bell-crank lever to, tends to pullthe.c0upler-bar downwardly, and a leaf-spring 5 tends to press saidcoupler-bar laterally, so that the cam-block s will protrude out throughthe opening 0' in the housing N and at the same time hold the roller 8retracted from the vertical slot 1". A plate t, carrying anantifriction-roller t, is secured in the top of the housing N, and thecoupler-bar rides on this roller when it is moved up or down. Abell-crank lever u is fnlcrumed on'the lower end of the housing N, withone of its arms normally in engagement with the protruding cam-block s.Another bell-crank lever to is fnlcru med on the frame K just underneaththe lever u, with one of its arms in engagement with the other arm ofthe lever to, and a wire a; is secured at one end to the other arm ofthe lever to, the other end of said wire being secured to a foot-treadlem, whereby said wire may be drawn down to rock said lever. When theoperator desires to cut the buttonhole either before or after the samehas been worked, he

rocksrthe lever to by means of the foottreadle, and said lever in turnrocks the other lever to, which presses the coupler-bar 0 laterally, sothat its roller 5 is moved through the slot 1" into the path of the cam'r. The said cam thereupon pushes the coupler-bar upwardly to effect theoperation of the cutting attachment, and as the coupler-bar rises itscamblock s rides along the interior of the housing-wall, therebymaintaining, with the assistance of the leaf-spring the said bar indirect vertical alinement with the link-j rod 0. As soon as the cam rreleases the roller 8 the two springs s and s will draw the coupler-barO downwardly and laterally, thereby moving the roller 8" out of the pathof the cam. The cam-block s is detachably secured tothe coupler-bar O byscrew-threaded engagement with the spindle y of the roller 8 The objectof this construction is that said cam-block ma be'detached, so that thecoupler-bar may be inserted in its housing N, and the cam-block is theninserted through the opening r and attached to the coupler-bar.

While the accompanying drawings illustrate one form of the invention, itis to be understood that changes in the details of con-. struetion maybe made without departing from the scope of the invention as defined inthe appended claims.

Having thus described my invention, what I claim as new, and desire tosecure byLetters Patent, is-

1. Inabuttonhole-sewingmachine,the combination of buttonhole-cuttingmechanism; power-driving mechanism therefor; a coupler adapted toconnect said cutting mechanism with the power mechanism, said couplerbeing movable in two directions, namely, laterally and longitudinally,and normally held out of engagement with said power mechan: ism; andmeans for moving said coupler in one direction into engagement with saidpower mechanism whereby the latter may move said.

coupler in the other direction to actuate the cutting mechanism, as setforth.

2. Inabuttonhole-sewingmachine,thecombination of buttonhole-cuttingmechanism; power-driving mechanism therefor which is normallydisconnected therefrom; a laterally and longitudinally movable couplerconnected to said cutting mechanism and springheld out of engagementwith said power mechanism; and means for moving said coupler laterallyinto engagement with said power mechanism whereby the latter may movesaid coupler longitudinally and actuate said cutting mechanism, as setforth.

3. Inabuttonhole-sewing machine,thecombination of the buttonholecuttingmechanism; power mechanism for driving the same, and provided with acam; a laterally and lon-. gitudinally movable coupler-bar having arocking connection with the cutting mechanism and normally held out 'ofthe path of said cam; and means for moving said coupler-bar laterallyinto the path of said cam whereby the latter may engage the, coupler-barand moveit longitudinally to actuatethe cutting mechanism, as setfort-h.

4. Inabuttonhole-sewing machine,the combination of a cutting block andknife; means, including a reciprocating rod, for actuating said cuttingblock and knife; power-driving mechanism adapted to continuouslyoperate; a movable coupler-bar having a rocking connection with said rodand normally held out of engagement with said power mechanism; means formoving said coupler-bar into engagement with said power mechanism,whereby to actuate said cutting mechanism; and means for automaticallyreturning said coupler-bar to its normal position, asset forth.

5. In a buttonhole-sewing machine,the combination of buttonhole-cuttingmechanism provided with an operating link-rod; a housing underneathsaidlink-rod and provided in opposite walls with a vertical slot and anopening; a coupler-bar mounted to move in said housing and connected tosaid link-rod to move the same and providedwith a camsurface normallyprotruding out of the opening in one housing-wall power-operatedmechanism moving past the slot in the other housing-wall; and means forpressing said coupler-bar so that a portion thereof will project throughthe slot in the other housing-wall. and be engaged by said cam to raisethe coupler-bar, as set forth.

G. In a bnttonhole-sewing machine, the combination of buttonholecuttingmechanism provided with a vertically-movable operating link-rod; ahousing underneath said linkrod and provided in opposite walls with avertical slot and an opening; a coupler-bar movable up and down in saidhousing and connected to said link-rod to move the same and provided onone side with a cam-block and on its opposite side with anantifrictionroller; springs tending to move said couplerbar downwardlyand laterally so that the camblock will protrude out'of the opening inone housing-wall and the antifriction-roller will not project throughthe slot in the opposite housing wall; power operated mechanism 'movingpast the said slot; and means for pressing said coupler-bar into thepath of said power-operated mechanism, as setforth.

7. In a buttonhole-sewing machine,the combination of a cutting block andknife; means, including a reciprocating rod, for actuating said cuttingblock and knife, said rod being provided witha rocking foot;continuously-moving power-driving mechanism; a

laterally and longitudinally movable couplerbar connected with saidrocking foot whereby to reciprocate said rod; and means for moving saidcoupler-bar laterally into engagement with. the power driving mechanismwhereby the latter may move said couplerbar longitudinally andreciprocate. said rod, as set forth.

8. In a buttonhole-sewing machine, a cutting attachment comprising avertically-movable knife; a vertically-movable knife-block coacting withsaid knife; a resser-bar for moving the said knife-block; an eccentricfor moving said knife; a longitudinally-movable eccentric-rodoperatively connected to said eccentric; and a connection between saidpresser-bar and eccentric-rod for moving both of said parts.

9. In a buttonhole-sewing machine, a cutting attachment comprising aswinging knifeholder; a knife carried thereby; a reciprocatingknife-block coacting with said knife; a presser-bar for moving saidknife-block toward said knife; an eccentric for swinging saidknife-holder toward said knife-block; a yielding eccentric-rod connectedto said eccentric; and a connection between said presser-bar andeccentric-rod for moving both of said parts.

10. In a buttonhole-sewing machine, a cutting attachment comprising aswinging knifeholder; a knife carried thereby; a reciprocatingknife-block coacting with said knife; a resser-bar for moving saidknife-block toward said knife; an eccentric for swinging saidknife-holder toward said knife-block; an eccentric-rod connected at oneend to said eccentric and constructed in telescopic sections yieldinglongitudinally with respect to each other; a bell-crank lever having onearm connected to said eccentric-rod; and a linkrod connected to saidpresser-bar and also connected to the other arm of said bell-cranklever.

11. In a buttonhole-sewing machine, a cutting attachment comprising aknife-block; a knife-holder movable toward and from said knife-block; aknife carried by said knifeholder; an eccentric for moving saidknifeholder; an adjustable bearing for said eccentric whereby the lattermay be moved to take up wear; and means for moving said eccentric.

12. In a buttonhole-sewing machine, a cutting attachment comprising aknife-block; a knife; a knife-holder for said knife movable toward andfrom said knife-block, and adjustable in size whereby said holder may beused for different-sized knives; and means for moving said knife-holder.

13. In a buttonhole-sewing machine, a cutting attachment comprising aknife-block; a knife-holder for said knife and movable toward and fromsaid knife-block, said knifeholder being constructed in sections adjustably connected together; a knife detachably held in one of saidsections; and means for moving said knife-holder.

14. In a buttonhole-sewing machine, a cutting attachment comprising aknife; a knifeblock movable toward and from said knife; a reciprocatingrod carrying said knife-block and provided in one end with anantifrictionball; a presser-bar adapted to press on said ball to movesaid rod toward said knife; and means for moving said lever.

15. In a buttonhole-sewing machine, a cutting attachment comprising aknife; a knifeblock movable toward and from said knife; a reciprocatingrod carrying said knife-block; and a presser-bar for pressing said rodwith its knife-block toward said knife and provided with a wear-plateadjustable toward and from said rod, substantially as set forth.

16. In a buttonhole-sewing machine, a cutting attachmentcomprisingaswingingknifeholder; a knife carried thereby; a reciproeatingknife-block coacting with said knife; a presser-bar for moving saidknife-block toward said knife; and a rod, H, arranged to swing saidknife-holder and connected with said presser-bar to move simultaneouslytherewith, said rod being yielding, as and for the purpose set forth.

17. In a buttonhole sewing machine, a knife-holder provided with meanswhereby it may be adjusted for the knife-openings of differentfeed-wheels, and also provided with means to detachably hold a knifewhereby different-sized knives may be secured thereto, as and for thepurpose set forth.

18. In a buttonhole-sewing machine, the combination of a knife-block; apresser-bar for moving said knife-block; a knife; a rod for moving saidknife; a link-rod connected to said presser-bar and to said first-namedrod for simultaneously actuating said knife-block and knife; powermechanism adapted to continuously operate; and means, which the operatormay employ either before or after the buttonhole has been stitched, forconnecting said power mechanism with said link-rod.

19. In a buttonhole-sewing machine, the combination ofbuttonhole-cutting mechanism; power mechanism adapted to continuouslyoperate; and uneans, which the operator may employ either before orafter the buttonhole has been stitched, for connecting the said powermechanism with the cutting mechanism, said means including a leverarranged to be actuated by the foot of the operator, as set forth.

In testimony whereof I aifix my signature in the presence of twowitnesses.

PHILIP FABISOII.

\Vitn esses:

FREDERICK S. STITT, CHARLES L. VIETSCH.

